C# code to compare two characters

Here, we are asking for two characters from the user – and checking whether they are the same characters or not?

// C# program for character comparison 
using System;
using System.IO;
using System.Text;

namespace IncludeHelp
{
    class Test
    {
        // Main Method 
        static void Main(string[] args)
        {
            char ch1;
            char ch2;

            //input characters
            Console.Write("Enter a character: ");
            ch1 = Console.ReadLine()[0];
            Console.Write("Enter another character: ");
            ch2 = Console.ReadLine()[0];
            
            //comparing characters
            if (ch1 == ch2)
                Console.WriteLine("Input characters are the same");
            else
                Console.WriteLine("Input characters are not the same");

            //hit ENTER to exit the program
            Console.ReadLine();
        }
    }
}

Output

First run:
Enter a character: A
Enter another character: A
Input characters are the same

Second run:
Enter a character: A
Enter another character: X
Input characters are not the same

C# code to compare characters in a string

Here, we are asking for a string from the user – and printing only vowels by comparing each character of the string with vowel characters.

// C# program for character comparison 
using System;
using System.IO;
using System.Text;

namespace IncludeHelp
{
    class Test
    {
        // Main Method 
        static void Main(string[] args)
        {
            string str;
            
            //input string
            Console.Write("Enter a string: ");
            str = Console.ReadLine();

            //printing the string
            Console.WriteLine("Input string is {0}", str);

            //printing vowels 
            Console.WriteLine("Vowels are...");
            foreach (char ch in str)
            {
                if (ch == 'A' || ch == 'a' || ch == 'E' || ch == 'e' ||
                    ch == 'I' || ch == 'i' || ch == 'O' || ch == 'o' || 
                    ch == 'U' || ch == 'u')
                {
                    Console.Write(ch);
                }
            }

            //hit ENTER to exit the program
            Console.ReadLine();
        }
    }
}

Output

Enter a string: IncludeHelp.com
Input string is IncludeHelp.com
Vowels are...
Iueeo